JS的深拷贝和浅拷贝

function deepCopy( from ){
    var new_obj = from instanceof Array?[]:{};
    for( var i in from ){
        if( typeof from[i] == ‘object‘ ){
            new_obj[i] = deepCopy(from[i])
        }else{
            new_obj[i] = from[i]
        }
    }
    return new_obj
}

function deepCopy( from ){
    return JSON.parse(JSON.stringify(from))
}